Here is the AccuWeather map timing the cold air:
Here is the probability of accumulation of 2 inches or more of snow over the next 72 hours starting at 6pm this evening.
And, there could be significant freezing rain. These are the probabilities of 0.10 inches of freezing rain (glaze ice) accumulation.
Because this system covers such a vast geographic area, it is impractical to pin this down city-by-city. So, check your local AccuWeather.com forecast.